Compressor



L. K. WARRICK ET AL I July 7, 1953 COMPRESSOR Filed on 20. 1950 1 .fnrJenl art I leZandKZUczrrzlc/ i and f nk Patented July 7, 1953 COMPRESSORLeland K. Warrick, Muskegon Heights, and Frank E. La Flame, Spring Lake,Mich., assignors to Borg-Warner Corporation, Chicago, 111., acorporation of Illinois Application October 20, 1950, Serial No. 191,277

This invention relates in general to refrigerating apparatus and hasreference to an improved form of compression constructions therefor.

Otherwise stated, the invention is embodied in refrigerator compressorconstructions and is directed to simplify the structural featuresthereof and their mode of operation and to provide a refrigerantcompressor which'may readily and'conveniently be employed universally tovarious types of refrigerator systems presently being commerciallyexploited.

More specifically stated, it is a particular object and accomplishmentof the invention to provide a motor compressor assembly having sealedcompartments providing convenient access and repair of parts thereofWithout disturbance of the hermetic seal.

Moreover, the present device seeks to employ conventional parts Wherevernecessary and possible, thereby to effect a further substantialreduction in the cost over the prevailing types of refrigerantcompressors presently being employed.

It is a general object and accomplishment of the invention to provide acompressor construction which is particularly adaptable for employmentin a refrigerating system of the type Wherein a refrigerating medium iscirculated through a closed system and is successively compressed agaseous state, condensed into a liquid and then expanded by evaporationat a relatively high pressure, the invention being particularlyconcerned with a compressor, the type generally applicable foremployment for domestic or other uses where individual units ofrelatively small capacity are employed and have particular relation toan improved arrangement of parts having special application as acombination refrigerant motor and compressor unit.

It is a detailed object and accomplishment of the invention to provideamotor compressor unit for refrigeration purposes and employing an axialair gap motor as a power source.

It is another detailed object of the invention to provide a motorcompressor unit of the above type and having an improved lubricatingarrangement for insuring the delivery of the necessary lubricant to eachof the vital moving parts.

Another object and accomplishment of the invention is to provide animproved refrigerating system by co-relating and especially designingthe various elements of the motor compressor combination units to effectadvantageous cooperation between said improved elements as will bestserve the purpose of providing an eflicient 7 Claims. (01. 230-139)system capable of being manufactured at low cost and yet giving themaximum of satisfactory service in use.

A further object and accomplishment of the invention is to provide animproved unit designed for refrigeration purposes and which shall haveanovel and compact arrangement of parts wherein said parts can be easilyand readily assembled andserviced.

Another aspect of the invention is to provide a motor compressorcombination unit having an improved arrangement of elements forming asealed housing refrigerant compressor assembly having the minimumover-all co-axial dimen sion while maintaining a high efficiency ofoperation and effecting a reduction in the cost of manufacturingover'thatof similar units of present manufacture.

An ancillary object and accomplishment of the invention is to provide anew and improved motor compressor unit which is adapted to beeconomically manufactured and which is so designed as to permit themanufacture and assembly thereof in accordance with present day largescale mass production manufacturing methods of construction andassembly.

The invention seeks, as a further object and accomplishment, to providea motor compressor unit particularly characterized by a designarrangement to more advantageously and satisfactorily perform thefunctions required of it and adapted to provide a compact unit whichWill successfully combine the factors of structural simplicity anddurability, and yet be economical to manufacture.

Additional objects, features and advantages of the invention disclosedherein will be apparent to persons skilled in the art after theoperation and construction thereof are understood from'the withindescription.

' It is preferred to accomplish the various ob- I refrigerant motorcompressor unit depicted in Fig. 2 and being taken substantially on theplane of the line it 3 in Fig. 2; and

Fig. l is a top plan View of a portion of the refrigerant motorcompressor unit depicted in Fig. 2 and illustrating the construction ofthe seal partition wall disposed within the compressor proper andforming an important feature of the present invention, this View beingtaken substantially on the plane of the line 4-4 in Fig. 2.

The drawings are to be understood as being more or less of a schematiccharacter for the purpose of illustrating and disclosing a typical orpreferred form of the improvements contem" plated herein and in thedrawings like reference characters identify the same parts in theseveral views.

As one possible example of advantageous em" ployment of the combinationrefrigerant compressor motor unit, reference is made to the drawings,particularly Fig. 1, wherein there is illus trated the refrigerant motorcompressor unit with which the present invention is particularlyconcerned, and designated in its entirety by the numeral Iii as beingadjunctively employed, for example, with a conventional refrigeratingsystem designated in its entirety by the letter A.

The illustrated refrigerating system may ccm prise the motor compressorunit IE, herein shown as being of the hermetically sealed type and adirectl connected condenser. After undergoing compression, the hotrefrigerant flows through a discharge line l2 and through theconvolutions of the condenser II which is air-cooled in the conventionalmanner, this extraction of heat be ing effective to reduce in somedegree both. the pressure and thetemperature of the refrigerant,although both are quite high compared to normal atmospheric conditions.

After. the mixed vapors and liquid refrigerant are discharged from thecondenser, they will flow through a conduit l3 into a valving device,which in this particular case is illustrated as a capillary tube orrestrictor M, which is connected. to an evaporator 15 having a headerI6. It is notable that the refrigerant is throttled in passing therestrictor I4 and thereafter will be expanded. at the discharge side ofthe restrictor and will be further expanded in the evaporator so that itwill become quite cooled and is, therefore, capable of absorbing heatfrom the storage compartment from the refrigerator and from the contentsthereof. After making its circuitous path through the evaporator, theexpanded and expended re frigerant is then returned to the motorcompressor unit Hi by means of a suction line ll, thus completing theclosed circuit.

Suilice it to say, since the invention is not particularly concernedWith the precise construction of the entire refrigerating system asillustrated, and/or its associated parts, they will not be furtherdescribed in detail, and it is deemed sufficient for all intentions andpurposes herein con tained to. show only portions thereof adjacent toand cooperating with the motor compressor unit contemplated herein.

I It is to be understood that details of construction of suchrefrigerating systems with which the refrigerant motor compressor unitcontemplated herein may advantageously be employed, and/or theirassociated parts, may be modified to suit particular conditions or tosatisfy the engineering genius of various manufacturers, and I do notwish to be limited tothe construction of these elements as set forthexcept where such co s u '4 tion particularly concerns the inventioncontemplated herein.

Heretofore, in prior art compressor constructions such units wereusually disposed in a machinery compartment forming a part of the lowerportion of a refrigerator cabinet. In such applications, the specificspace requirements were not of paramount importance and the forward partof the cabinet adjacent the machiner compartment was provided with ahinged vegetable bin in an effort to utilize some of this space. In recent years, the cubical content of a refrigerator has become a veryimportant item and, therefore, it has become necessary to find Ways andmeans to effect reduction of the size of the mechanical elements of arefrigerator so as to provide, as much as possible, more usable space inthe food compartment. It has been found that this can be accomplished inseveral ways. For example, the compressor may be reduced in size,thereby requiring a smaller machinery compartment, or, because of thereduction in size, the compressor and condenser forming a part of themechanical structure of a refrigerator may be disposed on the back sideof the refrigerator cabinet in the upper regions thereof adjacent theevaporator, thereby eliminating the necessity of a machinery compartmentin the lower portion of the cabinet. This position of the compressor asdescribed would permit utilization of the space formerly occupied by themechanism as a part of the food storage compartment.

It is recognized that in the prior art numerous attempts have been madeto provide a relatively small refrigerant compressor unit and yet maintain th desired capacity of the unit, but to the best of the applicantsknowledge, only very few of the prior art structures have had limitedsuc=- cessful applications and have been accorded only limitedcommercial. recognition.

It is believed that this fact results from the deficiencies of the priorart structures, and their non-adaptability to effectively overcome thedifficulties hereinbefore set forth.

Having thus described, by way of example, a possible adaptation of thesealed motor compressor unit and having described the generalenvironment surrounding the adaptation, the specific construction andfunction of the parts of said sealed motor compressor unit will now bedescribed in detail.

In the exemplary embodiment of the invention depicted in Fig. 2, thecompressor 28 is shown as being enclosed within a casing 22 and as beingin operative association with an electric motor generally indicated at24 and which is illustrated as being constructed in part integrally withthe casing 22 and arranged as a power source for operating thecompressor. The construction of the motor 24 is a unique feature of theinvention and preferably is of the alternating current type and adaptedto be supplied with electrical energy through suitable conduits 25operatively connected to the motor windings indicated generally at 26and which are arranged internally of the casing 22. Electric current maybe supplied to the motor for operating the same at intermittent periodsand the supply of current to the motor may be under the control of aswitch 2! which is operatively associated with the evaporator or freezerelement l5 of the refrigerating system so that the compressor may beoperated in such a way as to maintain the temperature thereof, and ofthe heated insulated compartment within which such evaporator may bearranged, within said predetermined temperature limits.

Attention is invited to Fig. 2, wherein it can be seen that the casing22 is divided into two chambers 22a and 2%, the chamber 22a beinghermetically sealed by virtue of the seal partition indicated in itsentirety by the numeral 98 and has the compressor operativcly disposedtherein, and the chamber 221) is provided with conventional seals and isadapted to have the stator portions of the motor operatively disposedtherein.

In the construction illustrated in Figs. 2 and 3. the compressor 28 isarranged within the hermetically sealed chamber 22a. and the vaporousrefrigerant from the evaporator is supplied to the intake side of thecompressor through the suction port 28 via the suction line ll. Therefrigerant is discharged from the compressor into the chamber 22a, ofthe casing 22 and the refrigerant is con-- ducted from the chamber 220,,through the discharge port 29 by means of the conduit 52, to thecondenser E I. Portions of the chamber 22a func" tion as a lubricantreservoir and the lubricant therein preferably stands to a levelindicated by the lines 30, or 3 l, in 2, depending on whether thecompressor is mounted on a vertical. or horizontal plane, and thelubricant is subjected to the discharge pressure of the compressor.Because the refrigerant medium is supplied to the evaporator element [5under control of a suitable refrigerant expansion control, such as a lowside float or the like, the space defined by the chamber 22a and thecondenser E I constitute the high pressure side of the refrigeratingsystem.

The lubricant is provided for lubricating the working parts of thesystem such as the moving parts of the compressor 26 and parts of themotor 24 and some of the lubricant will circulate with the refrigerantthroughout the system; however, a body of the lubricant will collect, asshown, in the lower portions of the chamber 220, which forms a part ofthe casing 22 to such an extent as to partially submerge the compressor28 therein. Because the lubricant in the casing is subject to thedischarge pressure of the compressor and as the compressor is partiallysubmerged in the lubricant, the working parts of the compressor will belubricated and sealed.

The casing 22 comprises a cup-shaped shell and a cover 4|. formed todefine the shape as shown to take advantage of structural strength andsave as much space as possible. 'The cover t! is provided with a flangedcentrally disposed through aperture 62 provided with threaded formationsadapted to receive for removable securement thereto a central stud-likesupport indicated in its entirety by the numeral 43, said stud-likesupport 63 being arranged to receive a suction line connection M and isprovided with suitable channels such as for the passage of refrigerant.The stud-lilre member 43 is provided with a substantially cir=-cular-shaped radially projecting flange 43a provided with a finishedsurfacets which will form an end plate or closure for the rotarycompressor, a circular shaped eccentric i? which can be seen in Figs. 2and 3 as being disposed off center from the central axis of thecompressor, and projecting axially from said eccentric 4? there isprovided a bearing 48.

It is notable that the stator 36 and the motor windings are suitablysecured to the cover 4| and it is important to understand that the coverH, the stator 36, the stud-like support member 43 in- It is notable thatthe cover M is 0 cluding the flange 43a, the eccentric 41 and thebearing 48 all remain stationary.

The compressor 20 further includes a cylinder 5d, a rotor 5!, a divider54 and an end plate 55. Thus, it can be seen that the flange 43a whichis provided with the finished surface 46, and the cylinder 50 includingthe end plate when assembled together, form a closed cylindrical chamber52 or pumping space in which the rotor 51 is'arranged for rotativemovement on the eccentric 41. The rotor 51 is freely journaled on theeccentric 4'5 and, it will be observed, is of less diameter than thepumping chamber 62 in which it is arranged.- The rotor 5! is of such 9size, relative to the cylinder 50, that there is a small workingclearance between the vertical faces of the rotor and the adjacentvertical faces defined by the finished surface 46 and the inside face ofthe end plate 55. Also, the diameter of the rotor 5! is such that thereis a slight clearance between the periphery of the rotor 55 and theadjacent cylinder wall of the pumping chamber 62 at that point where therotor 51 divides one side of the pumpin chamber 62 from the other sidethereof, as illustrated in Fig. 3, and this clearance is maintainedthroughout the operation of the compressor as the cylinder 58 movesaround an axis defined by the center of the compressor body in thedirection of the arrow 63 in Fig. 3.

In Fig. 2 it can be observed that the bottom plate 55 is suitablysecured to the cylinder 59 by means of the bolts as at 55 and thecylinder 5% is in turn fixedly secured to the rotor 35 of the motor 24.Thus, it can be seen that when the compressor is in operation, thecylinder will revolve in the direction indicated by the arrow 63 whilethe rotor 5| may freely rotate about the eccentric element 41 but theeccentric ele ment will remain stationary. This arrangement of partsdefines important differential characteristics of constructionheretofore not found in prior art practice.

The divider 54 is arranged for reciprocation within a slot 18 formed inthe cylinder 50 and is disposed so that end portions thereof are inengagement with the periphery of the rotor, as illustrated in Fig. 3, soas to separate the suction gas from the discharge gas in the pumpingchamber 52. The divider 54 defines fiat surfaces which slide on the flatsurfaces of the slot in which the divider 54 reciprocates. The divider54 preferably is of the same dimension with respect to thickness as theroto 5|, so that the divider 54 will form a movable seal between theperiphery of the rotor 5i and the walls of the pumping chamber 62.

The pumping chamber is provided with an intake port as at l! and with adischarge port 72 preferably, but not necessarily, controlled by a valveas at 13, the divider 54 is reoiprocably disposed in the slot Hi and isguided in its movement by a spring '14, one end of which being receivedinto a recess 16 disposed in the end portions of the divider 54 and theother end of the sprin being held in engagement with a wall defined by arefrigerant outlet chamber is forming a part of the cylinder 50, Spring[4 acts to hold the divider 54 in contact with the periphery of therotor 5|.

The discharge port 12 is cut into portions of the cylinder 5!! and opensinto the chamber '55 in which the valve 13, which controls the dischargeport, is arranged. It can be seen in Fig. 2 that the chamber 75 opensinto the chamber 22a of the casing 22. The valve 13 may be a flap valveor a check valve and is preferably anchored at one end thereof by meansof screws as at "H.

In order to prevent a reversal of the pressures during certainoperations of the compressor, there is provided a spring pressed valve80 which is disposed in the suction line and it can be seen that whenthe compressor is in operation, the suction of the refrigerant coupledwith the discharge pressure running through the entire circuit of therefrigerating system and entering the suction conduit 28 will force thevalve 8!? to open and permit refrigerant to flow through the compressor.When the compressor is not in operation, discharge and suction pressuresare not present and therefore the spring pressed valve 80 will be closedto prevent a reverse in the cycle of operation.

Thus, it can be seen that the path of the refrigerant through thecompressor is defined by its passage through the suction conduit 28 andpast the valve 80, through the conduit 45 and into the compressionchamber 62, whereupon the rotary action of the cylinder 50 cooperatingwith the function of the divider 54 will compress the refrigerant anddischarge the same through the discharge port 72, past the valve 13 andinto the chamber 22a, whereupon it will be discharged from the chamber22a by virtue of discharge connections 29 forming a part of the conduit12.

It is notable that an important feature of the invention is the uniqueassociation of parts, particularly the departure from conventionalcompressors in that the cylinder 50, which in prior art constructionsremains stationary, is rotated in this case which provides an assembledcornpressor unit of relatively small co-axial dimension giving theadvantage of being able to mount the compressor unit on the backportions of the refrigerator cabinet if desired. In some adaptations itmay be desirable to mount the compressor assembly in the conventionallower portions of the refrigerator cabinet. In this connection a minimumof space will be required and any savings in space may be transferred toenlargement of the food storage chambers, this being particularly truewhen the currently popular long door refrigerators are employed.

Particular attention is invited to Figs. 2 and i which clearlyillustrate the specific construction of the partition wall 90 which isan important feature of the present invention. This wall effectivelyseals off the chamber 22d, thereby to provide a hermetically sealedcompresso chamber in this region. The partition wall 9!] comprises asubstantially circular plate-like element preferably formed of stainlesssteel or of another metal having similar characteristics. It can be seenin Fig. 2 that the peripheral edges of the partition wall 90 may bewelded or frozen to adjacent portions of the casing 22 and the flange43a as shown.

An important advantage of the aforementioned construction is that thecover 4| may be removed from its position on the central post 43,thereby to expose the motor windings and the stator 35 for convenientrepairs thereon. Because the partition wall 90 provides the necessaryseal to the chamber 22a, the motor windings can be repaired withoutdisturbance to this seal arrangement.

Other important advantages of this construction are (1) that thecomplete refrigerating unit and the compressor dehydrating time periodis much less than that now required because the motor windings andinsulation do not have to be 8 dehydrated, (2) that the total possibleresidue in the refrigerating system is small because the motor stator(source of most 0f the metal chips, rust particles and cellulose fibres)is outside of the refrigerant system, and (3) that longer service lifecan be expected from refrigerating systems incorporating thesecompressors because the moisture and other minute deteriorationcompounds released from the stator insulation during infrequentoperating temperature peaks cannot enter the refrigerating systemcausing progressive breakdown of the lubricating oils and motor statorinsulation were it in the refrigerating systems, as well as causingrestriction or plugging of the refrigeration system.

Moreover, another important feature of this invention is that there arevery few moving parts. The moving parts of this construction being thecylinder 50 which is fixedly secured to the motor rotor 35, the rotor 5|which is rotatably mounted on the eccentric 41, and the divider 54.Because all Of these moving parts are suitably submerged in thelubricant and also sealed thereby, there will be very little wear of theparts and this construction will then tend toward long life andtrouble-free operation.

The instant motor compressor combination unit, being formed of simpleparts and readily available materials, lends itself to mass productionmanufacturing principles, thus affording a substantial saving in themanufacturing costs.

From the foregoing disclosure, it may be observed that we have providedan improved combination motor compressor unit which emciently fulfillsthe objects thereof as hereinbefore stated and which provides numerousadvantages which may be summarized as follows:

1. structurally simple, efficient and durable;

2. Economical to manufacture and readily adaptable to mass productionmanufacturing principles; and

3. The provision of a combination motor compressor for refrigerationpurposes employing an axial air gap motor as a power source therebysubstantially effecting a reductionin the manufacturing costs thereofwhile providing an effective seal arrangement dividing the compressorinto separate sealed compartments and further providing an improvedarrangement of the elements of the compressor to obtain a minimumover-all coaxial dimension while maintaining a high efficiency ofoperation and thereby effecting a reduction in the cost of manufacturingover that of similar units of present manufacture.

While we have illustrated embodiments of our invention, manymodifications may be made without departing from the spirit of theinvention, and we do not wish to be limited to the precise details ofconstruction set forth but wish to avail ourselves of all changes Withinthe scope of the appended claims.

We claim:

1. A combination motor-compressor unit comprising a housing divided by apartition wall into two compartments one of which being hermeticallysealed and the other being defined by a removable bell-shaped cover,said motor comprising a stator and a motor rotor, said compressorcomprising a stationary eccentric, a rotor mounted on said eccentric forrelative rotation therebetween, a compression chamber, a rotatablecylinder eccentrically mounted in respect to said motor and surroundingsaid rotor and eccentric to define said compression chamber, an inletleading to and an outlet leading from said compression chamber, andadivider located between said inlet and outlet carried by said cylinderfor reciprocation in said compression chamber, said motor rotor beingfixedly secured to said cylinder of the compressor and said cylinderbeing coaxially mounted for rotation responsive to the rotative forcesof the motor rotor, and the elements of said compressor including themotor rotor being disposed in the hermetically sealed compartment whilethe stator is disposed in the other of said compartments with .the partition wall being disposed between the stator and the motor rotor.

2. A compressor comprising a stationary eccentric, a rotor mounted onsaid eccentric for relative rotation therebetween, a compressionchamber, axcylinder eccentrically mounted in respect to said rotor andfor rotation and surrounding said rotor and eccentric to define saidcompression chamber, an inlet leading .to and an outlet leading fromsaid compression chamber, a divider located between said inlet andoutlet and carried by said cylinder and arranged for rotation therewithand having portions thereof in engagement with said rotor and arrangedfor reciprocation in said compression chamber responsive to the rotationof the cylinder and the action of the eccentric, an axial air gapelectric motor comprising a stator and a motor rotor fixedly secured tosaid cylinder whereby said cylinder may be caused to rotate responsiveto the rotative forces of the motor rotor, a housing for said compressorand motor, a partition wall dividing said housing into two compartmentsone of which being hermetically sealed and the other being defined by aremovable bell-shaped cover, the elements of said compressor includingthe motor rotor being disposed in the hermetically sealed compartmentwhile the stator is disposed in the other of said compartments with thepartition wall being disposed between the stator and the motor rotor.

3. The combination of a casing, an axial air gap electric motor and acompressor both disposed within the casing, said compressor comprising astationary eccentric, a rotor mounted on said eccentric for relativerotation therebetween, a compression chamber, a rotatable cylindereccentrically mounted in respect to said rotor and surrounding saidrotor and eccentric to define said compression chamber, an inlet leadingto and an outlet leading from said compression chamber, a dividerlocated between said outlet and inlet carried by said cylinder forreciprocation in said compression chamber, and said axial air gap motorcomprising a stator and a motor rotor fixedly secured to said cylinderof the compressor, said cylinder being coaxially mounted for rotationresponsive to the rotative forces of the motor rotor, said casing beingdivided by a partition wall into two compartments one of which beinghermetically sealed and the other being defined by a removablebell-shaped cover, and the elements of said compressor including themotor rotor being disposed in the hermetically sealed compartment whilethe stator is disposed in the other of said compartments with thepartition wall being disposed between the stator and the motor rotor.

4:. A compressor comprising a stud-like support member including astationary eccentric, a rotor mounted on said eccentric for relativerotation therebetween, a compression chamber, a cylinder eccentricallymounted in respect to said rotor and for rotation and surrounding saidrotor and eccentric to define said compression chamber; an inletleading-to andan outletleading from said compression chamber, adividerlocated between said inlet and outlet and carried by said cylinder andarranged for rotation therewith and having portions thereof inengagement with said, rotor and arranged for reciprocation in saidcompression chamber responsive to rota- :tion of the cylinder and actionof the eccentric,

in combination 'with-an axial air gap electric motor comprising astator, a motor rotor fixedly secured to vsaid cylinder whereby saidcylinder may be caused to rotate responsive to rotative forces of themotor;rotor, and means including aipartition wall disposed between thestator and the motor rotor and cooperating with thestudof the compressorand formed integral with said stud-like support member, a rotor mountedon said eccentric for relative rotation therebetween, a compressionchambena rotatable cylinder eccentrically mounted in respect to saidrotor and surrounding said rotor and eccentric and cooperating with saidend plate to define said compression chamber, an inlet leading to and anoutlet leading from said compressor, a divider located between saidinlet and outlet and carried by said cylinder for reciprocation in saidcompression chamber, an electric motor comprising a stator carried bysaid closure member, a motor rotor fixedly secured to said cylinder,said cylinder being coaxially mounted for rotation responsive to therotative forces of the motor rotor, a partition wall afiixed to saidhousing and said end plate and disposed between said stator and saidmotor rotor forming two compartments whereby to provide a hermeticallysealed compartment for said compression chamber and motor rotor and aremovable bell shaped compartment for said stator thereby permittingremoval of said closure member and stator for access thereto withoutdisturbing said compression chamber and motor rotor.

6. In a motor compressor assembly, the combination of a base and a covertherefor to provide a casing, a stud-like support member centrallydisposed of the casing and having portions thereof formed to define astationary eccentric, a bearing and an end plate which comprise parts ofthe compressor, a rotor mounted on said eccentric for relative rotationtherebetween, a compression chamber and an eccentrically mountedcylinder surrounding said rotor and said eccentric and cooperating withsaid end plate to define said compression chamber, said stud-likesupport member having fluid conduits opening into said compressionchamber and forming the suction side of the compressor, an inlet leadingto and an outlet leading from said compression chamber, a dividerlocated between said outlet and inlet carried by said cylinder forreciprocation in said compression chamber, an electric motor comprisinga stator carried by said cover, and a motor rotor fixedly secured tosaid cylinder, said cylinder being coaxially mounted for rotationresponsive to the rotative forces of the motor rotor, and a partitionWall secured to said housing and said stud-1ike sup- 11 port anddisposed between said stator and said motor rotor to effectively sealthe compression chamber from said stator.

7. A motor assembly comprising the combination of a housing with aclosure member to provide a casing, a stud-like support member centrallydisposed Of the casing and having portions thereof to define astationary eccentric, a bearing and an end plate which comprise parts ofthe compressor, a rotor mounted on said eccentric for relative rotationtherebetween, a compression chamber, a cylinder eccentrically mounted inrespect to said rotor and surrounding said rotor and eccentric andcooperating with said end plate to define said compression chamber, saidstud-like support having fluid conduits opening into said compressionchamber and forming the suction side of the compressor, an inlet leadingto and an outlet leading from said compression chamber, a dividerlocated between said outlet and inlet carried by said cylinder forreciprocation, an electric motor comprising a stator carried by saidclosure member and a motor rotor fixedly secured to said cylinder, saidcylinder being coaxially mounted for rotation responsive to the rotativeforces of the motor rotor, a partition wall afiixed to said 12 housingand said end plate and disposed between said stator and said motor rotorforming two compartments to effectively seal the compression chamberfrom the stator, one being a removable bell shaped compartment for saidrotor, said stud-like support extending through said closure member andhaving threads thereon, means defining a threaded aperture in saidclosure member cooperating with said stud-like support thus threadablysecuring said closure member to said housing whereby easy access isavailable to said stator.

LELAND K. WARRICK.

FRANK E. LA FLAME.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,992,348 Belden Feb. 26, 1935 2,172,500 Clements Sept. 12,1939 2,415,011 Hubacker Jan. 28, 1947 2,541,906 Anderson Feb. 13, 19512,557,879 Lewis June 19, 1951 FOREIGN PATENTS Number Country Date600,056 Germany July 13, 1934

